[R] plotting log regression

[Rui Barradas]

Hello,

How can you expect to see the fit line if you are ploting x and y 
values, not their logarithms?
And your definitions of x and y are wrong, they should use c().

x <- c(1,2,3,4,5)
y <- c(6,7,8,9,10)

plot(log(x), log(y))

fit <- lm(log(y) ~ log(x))  # Same as glm
abline(fit)


Please read R-intro, in the doc folder of your installation of R.

Hope this helps,

Rui Barradas
Em 14-12-2012 13:58, mrkooper escreveu:
> I want to plot the regression line of a log regression into a plot with my
> normal, nonlog, data.
>
> for example
>
> x <- (1,2,3,4,5)
> y <- (6,7,8,9,10)
>
> plot (x,y)
>
> I tried a log-regression by
>
> a <- glm (log(y) ~ log(x))
>
> and then i tried to insert the answer to my graph, where the standard values
> are shown:
> abline (a, col="red")
>
> unfortunately it does not work....
>
>
>
>
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